By the time you ____ in, I ____ two letters.
| A．had come, had written | B．came, wrote |
| C．come, have written | D．came, had written |
I always had doubts he would be the best man for the job , but now I don’t doubt he can do it.
| A．whether; whether | B．that ; if |
| C．if; whether | D．whether; that |
As teenagers, it is not until we are able to face difficulties bravely we are mature enough.
| A．which | B．when | C．that | D．whether |
a large salary rise already, Sarah is thinking of buying a new apartment.
| A．Receiving | B．Having received |
| C．received | D．To receive |
Printing passengers’ names and ID numbers on tickets will make harder to protect their private information.
| A．one | B．those | C．it | D．them |
The boys were about to go out to play football suddenly it began to rain.
| A．when | B．as | C．while | D．then |